Add opencv native library and java api

NOTE:

 - This is from opencv builds on my OSX (libopencv_java248.dylib)
   and EC2 Ubuntu (libopencv_java248.so).

 - While there are no other external dependencies, it is very unclear
   how portable the built libraries are between different systems

 - Running/Testing requires setting java.library.path. Example:
     sbt -Djava.library.path=~/code/moire/lib/ test